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Bot GPT 4-o mini To determine the spectral features of Sirius, we can refer to the temperature of the star. At a temperature of 9,940K, Sirius is classified as a spectral type A (specifically A1V for Sirius A).
Typically, stars with temperatures in the range of 7,500K to 10,000K show strong hydrogen lines in their spectra, along with some ionized metals. Therefore, the most appropriate choice based on its temperature is:
**Strong hydrogen, some ionized metals.**
This aligns with the spectral characteristics expected in A-type stars, where hydrogen lines are prominent and there is also evidence of ionized metals such as calcium and iron.